I just had a thought......Could he have been out of town and MF sent pics of the baby, then he saw news of HB and MC disappearance compared the pictures and then notified LE? MF could have driven him to the airport before all this happened, reason being the black SUV was at the home.
ETA:mI'm sure she wasn't driving the car with no tags, would be nice to know what day CG left town, could have been the day HB went missing. MF dropped him off and headed to HB's.
This is just a wild thought. I don't believe it was CG who notified LE of anything, I get the impression he was more shocked than anyone. But the 'ETA' above.. if the silver/grey car registered to MF didn't have tags (is that a fact???), then for SURE she couldn't/wouldn't have risked a planned kidnapping/murder event using that vehicle.
Ok nevermind, .. my proposed theory isn't panning out already.
I was thinking.. I wonder if the couple had just stored the silver car in the back yard until they decided to get it 'tagged'. (I'm not sure how you renew a vehicle's license over there?) But if it wasn't properly licensed, they could've put it in the rear yard so as not to be seen, etc., until such time as they decided to re-license it? While CG is away, MF uses his vehicle. She visits HB's home with CG's black SUV (is it confirmed that that is the type/color of vehicle that he even drives/owns?), kidnaps HB and the baby... murders HB at some point along the way.. gets back to her home and then transfers the body into the trunk of the silver car. Police show up a week later, based on some kind of a tip, and they're looking for the black vehicle (because possibly that is what HB was seen on video getting into willingly? - we haven't been told the vehicle info yet).. they find the black SUV at the home they had received a tip about, they see MF outside (or possibly even CG, as it was never stated who police found and 'detained' outside of the home). Possibly they take CG into custody (this is based on news that his mother showed up saying that she got a call saying her son had been arrested?) just based on the vehicle alone. In the meantime, officers sit there outside with MF, questioning her, until they get their search warrants in order. MF tells them all about how she just gave birth to a baby girl herself, and etc. Police finally get their search warrants, and voila, they find HB's body inside the trunk of the grey car in the back yard, just feet away from where MF was sitting there talking with police.
This theory falls apart however, when I remember the next door neighbor saying on a news clip that they had been wondering where MF's car had gone (or something to that effect). So that would presumably mean that MF was indeed using her vehicle up until that point and that it was visible in the driveway to neighbors?
Also, just occurred to me.. I wonder if the neighbors heard an infant crying incessantly (it's possible that baby Margo could feel the tension coming from MF and was not a happy, content newborn?).. and they were worried about it because CG was away, and since they couldn't see MF's silver car, they perhaps thought she wasn't home, and that an infant was suffering inside, and so they called??
All just speculation.